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One of the responsibilities of the 1st Battalion, 506th, from
April 1987 to September 1991 was to man the guard posts on the DMZ (including Guard Post Collier) during December through February every year. |

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The guard post duties were divided into 3 shifts: guard duty,
various details, and rest. The squads in a platoon would rotate shifts every twelve hours. |

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The flags of the two Koreas as seen from Guard Post Collier:
the far flag is flying above Kichong-dong (Propaganda Village), North Korea. The closer flag is flying over Taesong-dong (Freedom Village), South Korea. |

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